A:AnswerIt does have 4K HDMI pass through. When you turn the unit off, there is a slight delay and the previously selected HDMI input appears again on the screen.
A:AnswerWell, there is no way to hook up the dedicated Bose Equalizer, and with the equalizer, the 901 will sound like crap. Very few modern AV receivers offer the pre-out/main-ins needed to hook up an EQ, or a tape monitor loop.